Filthy. I saw zero semblance of an offensive foul there. It is sometimes frustrating to hear such allegations after each of these types of flushes (not saying you were alleging though). Virtually anytime someone jumps off two feet while leading with the left foot, that off arm must always start high and swing low, even when wide open. It's a part of the process of propulsion and elevation. Unfortunately, some defenders opt to jump into the meat grinder.